/*
 * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
 * Released under the terms of the GNU GPL v2.0.
 */

#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <regex.h>
#include <sys/utsname.h>

#define LKC_DIRECT_LINK
#include "lkc.h"

struct symbol symbol_yes =
                  {
                      .name = "y",
                      .curr = {"y", yes},
                      .flags = SYMBOL_CONST | SYMBOL_VALID,
},
              symbol_mod =
                  {
                      .name = "m",
                      .curr = {"m", mod},
                      .flags = SYMBOL_CONST | SYMBOL_VALID,
},
              symbol_no =
                  {
                      .name = "n",
                      .curr = {"n", no},
                      .flags = SYMBOL_CONST | SYMBOL_VALID,
},
              symbol_empty = {
                  .name = "",
                  .curr = {"", no},
                  .flags = SYMBOL_VALID,
};

struct symbol *sym_defconfig_list;
struct symbol *modules_sym;
tristate modules_val;

struct expr *sym_env_list;

void sym_add_default(struct symbol *sym, const char *def) {
    struct property *prop = prop_alloc(P_DEFAULT, sym);

    prop->expr = expr_alloc_symbol(sym_lookup(def, SYMBOL_CONST));
}

void sym_init(void) {
    struct symbol *sym;
    struct utsname uts;
    static bool inited = false;

    if (inited) return;
    inited = true;

    uname(&uts);

    sym = sym_lookup("UNAME_RELEASE", 0);
    sym->type = S_STRING;
    sym->flags |= SYMBOL_AUTO;
    sym_add_default(sym, uts.release);
}

enum symbol_type sym_get_type(struct symbol *sym) {
    enum symbol_type type = sym->type;

    if (type == S_TRISTATE) {
        if (sym_is_choice_value(sym) && sym->visible == yes)
            type = S_BOOLEAN;
        else if (modules_val == no)
            type = S_BOOLEAN;
    }
    return type;
}

const char *sym_type_name(enum symbol_type type) {
    switch (type) {
        case S_BOOLEAN:
            return "boolean";
        case S_TRISTATE:
            return "tristate";
        case S_INT:
            return "integer";
        case S_HEX:
            return "hex";
        case S_STRING:
            return "string";
        case S_UNKNOWN:
            return "unknown";
        case S_OTHER:
            break;
    }
    return "???";
}

struct property *sym_get_choice_prop(struct symbol *sym) {
    struct property *prop;

    for_all_choices(sym, prop) return prop;
    return NULL;
}

struct property *sym_get_env_prop(struct symbol *sym) {
    struct property *prop;

    for_all_properties(sym, prop, P_ENV) return prop;
    return NULL;
}

struct property *sym_get_default_prop(struct symbol *sym) {
    struct property *prop;

    for_all_defaults(sym, prop) {
        prop->visible.tri = expr_calc_value(prop->visible.expr);
        if (prop->visible.tri != no) return prop;
    }
    return NULL;
}

struct property *sym_get_range_prop(struct symbol *sym) {
    struct property *prop;

    for_all_properties(sym, prop, P_RANGE) {
        prop->visible.tri = expr_calc_value(prop->visible.expr);
        if (prop->visible.tri != no) return prop;
    }
    return NULL;
}

static int sym_get_range_val(struct symbol *sym, int base) {
    sym_calc_value(sym);
    switch (sym->type) {
        case S_INT:
            base = 10;
            break;
        case S_HEX:
            base = 16;
            break;
        default:
            break;
    }
    return strtol(sym->curr.val, NULL, base);
}

static void sym_validate_range(struct symbol *sym) {
    struct property *prop;
    int base, val, val2;
    char str[64];

    switch (sym->type) {
        case S_INT:
            base = 10;
            break;
        case S_HEX:
            base = 16;
            break;
        default:
            return;
    }
    prop = sym_get_range_prop(sym);
    if (!prop) return;
    val = strtol(sym->curr.val, NULL, base);
    val2 = sym_get_range_val(prop->expr->left.sym, base);
    if (val >= val2) {
        val2 = sym_get_range_val(prop->expr->right.sym, base);
        if (val <= val2) return;
    }
    if (sym->type == S_INT)
        sprintf(str, "%d", val2);
    else
        sprintf(str, "0x%x", val2);
    sym->curr.val = strdup(str);
}

static void sym_calc_visibility(struct symbol *sym) {
    struct property *prop;
    tristate tri;

    /* any prompt visible? */
    tri = no;
    for_all_prompts(sym, prop) {
        prop->visible.tri = expr_calc_value(prop->visible.expr);
        tri = EXPR_OR(tri, prop->visible.tri);
    }
    if (tri == mod && (sym->type != S_TRISTATE || modules_val == no)) tri = yes;
    if (sym->visible != tri) {
        sym->visible = tri;
        sym_set_changed(sym);
    }
    if (sym_is_choice_value(sym)) return;
    tri = no;
    if (sym->rev_dep.expr) tri = expr_calc_value(sym->rev_dep.expr);
    if (tri == mod && sym_get_type(sym) == S_BOOLEAN) tri = yes;
    if (sym->rev_dep.tri != tri) {
        sym->rev_dep.tri = tri;
        sym_set_changed(sym);
    }
}

static struct symbol *sym_calc_choice(struct symbol *sym) {
    struct symbol *def_sym;
    struct property *prop;
    struct expr *e;

    /* is the user choice visible? */
    def_sym = sym->def[S_DEF_USER].val;
    if (def_sym) {
        sym_calc_visibility(def_sym);
        if (def_sym->visible != no) return def_sym;
    }

    /* any of the defaults visible? */
    for_all_defaults(sym, prop) {
        prop->visible.tri = expr_calc_value(prop->visible.expr);
        if (prop->visible.tri == no) continue;
        def_sym = prop_get_symbol(prop);
        sym_calc_visibility(def_sym);
        if (def_sym->visible != no) return def_sym;
    }

    /* just get the first visible value */
    prop = sym_get_choice_prop(sym);
    expr_list_for_each_sym(prop->expr, e, def_sym) {
        sym_calc_visibility(def_sym);
        if (def_sym->visible != no) return def_sym;
    }

    /* no choice? reset tristate value */
    sym->curr.tri = no;
    return NULL;
}

void sym_calc_value(struct symbol *sym) {
    struct symbol_value newval, oldval;
    struct property *prop;
    struct expr *e;

    if (!sym) return;

    if (sym->flags & SYMBOL_VALID) return;
    sym->flags |= SYMBOL_VALID;

    oldval = sym->curr;

    switch (sym->type) {
        case S_INT:
        case S_HEX:
        case S_STRING:
            newval = symbol_empty.curr;
            break;
        case S_BOOLEAN:
        case S_TRISTATE:
            newval = symbol_no.curr;
            break;
        default:
            sym->curr.val = sym->name;
            sym->curr.tri = no;
            return;
    }
    if (!sym_is_choice_value(sym)) sym->flags &= ~SYMBOL_WRITE;

    sym_calc_visibility(sym);

    /* set default if recursively called */
    sym->curr = newval;

    switch (sym_get_type(sym)) {
        case S_BOOLEAN:
        case S_TRISTATE:
            if (sym_is_choice_value(sym) && sym->visible == yes) {
                prop = sym_get_choice_prop(sym);
                newval.tri = (prop_get_symbol(prop)->curr.val == sym) ? yes : no;
            } else {
                if (sym->visible != no) {
                    /* if the symbol is visible use the user value
                     * if available, otherwise try the default value
                     */
                    sym->flags |= SYMBOL_WRITE;
                    if (sym_has_value(sym)) {
                        newval.tri = EXPR_AND(sym->def[S_DEF_USER].tri, sym->visible);
                        goto calc_newval;
                    }
                }
                if (sym->rev_dep.tri != no) sym->flags |= SYMBOL_WRITE;
                if (!sym_is_choice(sym)) {
                    prop = sym_get_default_prop(sym);
                    if (prop) {
                        sym->flags |= SYMBOL_WRITE;
                        newval.tri = EXPR_AND(expr_calc_value(prop->expr), prop->visible.tri);
                    }
                }
            calc_newval:
                newval.tri = EXPR_OR(newval.tri, sym->rev_dep.tri);
            }
            if (newval.tri == mod && sym_get_type(sym) == S_BOOLEAN) newval.tri = yes;
            break;
        case S_STRING:
        case S_HEX:
        case S_INT:
            if (sym->visible != no) {
                sym->flags |= SYMBOL_WRITE;
                if (sym_has_value(sym)) {
                    newval.val = sym->def[S_DEF_USER].val;
                    break;
                }
            }
            prop = sym_get_default_prop(sym);
            if (prop) {
                struct symbol *ds = prop_get_symbol(prop);
                if (ds) {
                    sym->flags |= SYMBOL_WRITE;
                    sym_calc_value(ds);
                    newval.val = ds->curr.val;
                }
            }
            break;
        default:;
    }

    sym->curr = newval;
    if (sym_is_choice(sym) && newval.tri == yes) sym->curr.val = sym_calc_choice(sym);
    sym_validate_range(sym);

    if (memcmp(&oldval, &sym->curr, sizeof(oldval))) {
        sym_set_changed(sym);
        if (modules_sym == sym) {
            sym_set_all_changed();
            modules_val = modules_sym->curr.tri;
        }
    }

    if (sym_is_choice(sym)) {
        struct symbol *choice_sym;
        int flags = sym->flags & (SYMBOL_CHANGED | SYMBOL_WRITE);

        prop = sym_get_choice_prop(sym);
        expr_list_for_each_sym(prop->expr, e, choice_sym) {
            choice_sym->flags |= flags;
            if (flags & SYMBOL_CHANGED) sym_set_changed(choice_sym);
        }
    }

    if (sym->flags & SYMBOL_AUTO) sym->flags &= ~SYMBOL_WRITE;
}

void sym_clear_all_valid(void) {
    struct symbol *sym;
    int i;

    for_all_symbols(i, sym) sym->flags &= ~SYMBOL_VALID;
    sym_add_change_count(1);
    if (modules_sym) sym_calc_value(modules_sym);
}

void sym_set_changed(struct symbol *sym) {
    struct property *prop;

    sym->flags |= SYMBOL_CHANGED;
    for (prop = sym->prop; prop; prop = prop->next) {
        if (prop->menu) prop->menu->flags |= MENU_CHANGED;
    }
}

void sym_set_all_changed(void) {
    struct symbol *sym;
    int i;

    for_all_symbols(i, sym) sym_set_changed(sym);
}

bool sym_tristate_within_range(struct symbol *sym, tristate val) {
    int type = sym_get_type(sym);

    if (sym->visible == no) return false;

    if (type != S_BOOLEAN && type != S_TRISTATE) return false;

    if (type == S_BOOLEAN && val == mod) return false;
    if (sym->visible <= sym->rev_dep.tri) return false;
    if (sym_is_choice_value(sym) && sym->visible == yes) return val == yes;
    return val >= sym->rev_dep.tri && val <= sym->visible;
}

bool sym_set_tristate_value(struct symbol *sym, tristate val) {
    tristate oldval = sym_get_tristate_value(sym);

    if (oldval != val && !sym_tristate_within_range(sym, val)) return false;

    if (!(sym->flags & SYMBOL_DEF_USER)) {
        sym->flags |= SYMBOL_DEF_USER;
        sym_set_changed(sym);
    }
    /*
     * setting a choice value also resets the new flag of the choice
     * symbol and all other choice values.
     */
    if (sym_is_choice_value(sym) && val == yes) {
        struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
        struct property *prop;
        struct expr *e;

        cs->def[S_DEF_USER].val = sym;
        cs->flags |= SYMBOL_DEF_USER;
        prop = sym_get_choice_prop(cs);
        for (e = prop->expr; e; e = e->left.expr) {
            if (e->right.sym->visible != no) e->right.sym->flags |= SYMBOL_DEF_USER;
        }
    }

    sym->def[S_DEF_USER].tri = val;
    if (oldval != val) sym_clear_all_valid();

    return true;
}

tristate sym_toggle_tristate_value(struct symbol *sym) {
    tristate oldval, newval;

    oldval = newval = sym_get_tristate_value(sym);
    do {
        switch (newval) {
            case no:
                newval = mod;
                break;
            case mod:
                newval = yes;
                break;
            case yes:
                newval = no;
                break;
        }
        if (sym_set_tristate_value(sym, newval)) break;
    } while (oldval != newval);
    return newval;
}

bool sym_string_valid(struct symbol *sym, const char *str) {
    signed char ch;

    switch (sym->type) {
        case S_STRING:
            return true;
        case S_INT:
            ch = *str++;
            if (ch == '-') ch = *str++;
            if (!isdigit(ch)) return false;
            if (ch == '0' && *str != 0) return false;
            while ((ch = *str++)) {
                if (!isdigit(ch)) return false;
            }
            return true;
        case S_HEX:
            if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X')) str += 2;
            ch = *str++;
            do {
                if (!isxdigit(ch)) return false;
            } while ((ch = *str++));
            return true;
        case S_BOOLEAN:
        case S_TRISTATE:
            switch (str[0]) {
                case 'y':
                case 'Y':
                case 'm':
                case 'M':
                case 'n':
                case 'N':
                    return true;
            }
            return false;
        default:
            return false;
    }
}

bool sym_string_within_range(struct symbol *sym, const char *str) {
    struct property *prop;
    int val;

    switch (sym->type) {
        case S_STRING:
            return sym_string_valid(sym, str);
        case S_INT:
            if (!sym_string_valid(sym, str)) return false;
            prop = sym_get_range_prop(sym);
            if (!prop) return true;
            val = strtol(str, NULL, 10);
            return val >= sym_get_range_val(prop->expr->left.sym, 10) && val <= sym_get_range_val(prop->expr->right.sym, 10);
        case S_HEX:
            if (!sym_string_valid(sym, str)) return false;
            prop = sym_get_range_prop(sym);
            if (!prop) return true;
            val = strtol(str, NULL, 16);
            return val >= sym_get_range_val(prop->expr->left.sym, 16) && val <= sym_get_range_val(prop->expr->right.sym, 16);
        case S_BOOLEAN:
        case S_TRISTATE:
            switch (str[0]) {
                case 'y':
                case 'Y':
                    return sym_tristate_within_range(sym, yes);
                case 'm':
                case 'M':
                    return sym_tristate_within_range(sym, mod);
                case 'n':
                case 'N':
                    return sym_tristate_within_range(sym, no);
            }
            return false;
        default:
            return false;
    }
}

bool sym_set_string_value(struct symbol *sym, const char *newval) {
    const char *oldval;
    char *val;
    int size;

    switch (sym->type) {
        case S_BOOLEAN:
        case S_TRISTATE:
            switch (newval[0]) {
                case 'y':
                case 'Y':
                    return sym_set_tristate_value(sym, yes);
                case 'm':
                case 'M':
                    return sym_set_tristate_value(sym, mod);
                case 'n':
                case 'N':
                    return sym_set_tristate_value(sym, no);
            }
            return false;
        default:;
    }

    if (!sym_string_within_range(sym, newval)) return false;

    if (!(sym->flags & SYMBOL_DEF_USER)) {
        sym->flags |= SYMBOL_DEF_USER;
        sym_set_changed(sym);
    }

    oldval = sym->def[S_DEF_USER].val;
    size = strlen(newval) + 1;
    if (sym->type == S_HEX && (newval[0] != '0' || (newval[1] != 'x' && newval[1] != 'X'))) {
        size += 2;
        sym->def[S_DEF_USER].val = val = malloc(size);
        *val++ = '0';
        *val++ = 'x';
    } else if (!oldval || strcmp(oldval, newval))
        sym->def[S_DEF_USER].val = val = malloc(size);
    else
        return true;

    strcpy(val, newval);
    free((void *)oldval);
    sym_clear_all_valid();

    return true;
}

const char *sym_get_string_value(struct symbol *sym) {
    tristate val;

    switch (sym->type) {
        case S_BOOLEAN:
        case S_TRISTATE:
            val = sym_get_tristate_value(sym);
            switch (val) {
                case no:
                    return "n";
                case mod:
                    return "m";
                case yes:
                    return "y";
            }
            break;
        default:;
    }
    return (const char *)sym->curr.val;
}

bool sym_is_changable(struct symbol *sym) {
    return sym->visible > sym->rev_dep.tri;
}

struct symbol *sym_lookup(const char *name, int flags) {
    struct symbol *symbol;
    const char *ptr;
    char *new_name;
    int hash = 0;

    if (name) {
        if (name[0] && !name[1]) {
            switch (name[0]) {
                case 'y':
                    return &symbol_yes;
                case 'm':
                    return &symbol_mod;
                case 'n':
                    return &symbol_no;
            }
        }
        for (ptr = name; *ptr; ptr++) hash += *ptr;
        hash &= 0xff;

        for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
            if (!strcmp(symbol->name, name) && (flags ? symbol->flags & flags : !(symbol->flags & (SYMBOL_CONST | SYMBOL_CHOICE)))) return symbol;
        }
        new_name = strdup(name);
    } else {
        new_name = NULL;
        hash = 256;
    }

    symbol = malloc(sizeof(*symbol));
    memset(symbol, 0, sizeof(*symbol));
    symbol->name = new_name;
    symbol->type = S_UNKNOWN;
    symbol->flags |= flags;

    symbol->next = symbol_hash[hash];
    symbol_hash[hash] = symbol;

    return symbol;
}

struct symbol *sym_find(const char *name) {
    struct symbol *symbol = NULL;
    const char *ptr;
    int hash = 0;

    if (!name) return NULL;

    if (name[0] && !name[1]) {
        switch (name[0]) {
            case 'y':
                return &symbol_yes;
            case 'm':
                return &symbol_mod;
            case 'n':
                return &symbol_no;
        }
    }
    for (ptr = name; *ptr; ptr++) hash += *ptr;
    hash &= 0xff;

    for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
        if (!strcmp(symbol->name, name) && !(symbol->flags & SYMBOL_CONST)) break;
    }

    return symbol;
}

struct symbol **sym_re_search(const char *pattern) {
    struct symbol *sym, **sym_arr = NULL;
    int i, cnt, size;
    regex_t re;

    cnt = size = 0;
    /* Skip if empty */
    if (strlen(pattern) == 0) return NULL;
    if (regcomp(&re, pattern, REG_EXTENDED | REG_NOSUB | REG_ICASE)) return NULL;

    for_all_symbols(i, sym) {
        if (sym->flags & SYMBOL_CONST || !sym->name) continue;
        if (regexec(&re, sym->name, 0, NULL, 0)) continue;
        if (cnt + 1 >= size) {
            void *tmp = sym_arr;
            size += 16;
            sym_arr = realloc(sym_arr, size * sizeof(struct symbol *));
            if (!sym_arr) {
                free(tmp);
                return NULL;
            }
        }
        sym_arr[cnt++] = sym;
    }
    if (sym_arr) sym_arr[cnt] = NULL;
    regfree(&re);

    return sym_arr;
}

static struct symbol *sym_check_expr_deps(struct expr *e) {
    struct symbol *sym;

    if (!e) return NULL;
    switch (e->type) {
        case E_OR:
        case E_AND:
            sym = sym_check_expr_deps(e->left.expr);
            if (sym) return sym;
            return sym_check_expr_deps(e->right.expr);
        case E_NOT:
            return sym_check_expr_deps(e->left.expr);
        case E_EQUAL:
        case E_UNEQUAL:
            sym = sym_check_deps(e->left.sym);
            if (sym) return sym;
            return sym_check_deps(e->right.sym);
        case E_SYMBOL:
            return sym_check_deps(e->left.sym);
        default:
            break;
    }
    printf("Oops! How to check %d?\n", e->type);
    return NULL;
}

/* return NULL when dependencies are OK */
static struct symbol *sym_check_sym_deps(struct symbol *sym) {
    struct symbol *sym2;
    struct property *prop;

    sym2 = sym_check_expr_deps(sym->rev_dep.expr);
    if (sym2) return sym2;

    for (prop = sym->prop; prop; prop = prop->next) {
        if (prop->type == P_CHOICE || prop->type == P_SELECT) continue;
        sym2 = sym_check_expr_deps(prop->visible.expr);
        if (sym2) break;
        if (prop->type != P_DEFAULT || sym_is_choice(sym)) continue;
        sym2 = sym_check_expr_deps(prop->expr);
        if (sym2) break;
    }

    return sym2;
}

static struct symbol *sym_check_choice_deps(struct symbol *choice) {
    struct symbol *sym, *sym2;
    struct property *prop;
    struct expr *e;

    prop = sym_get_choice_prop(choice);
    expr_list_for_each_sym(prop->expr, e, sym) sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);

    choice->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
    sym2 = sym_check_sym_deps(choice);
    choice->flags &= ~SYMBOL_CHECK;
    if (sym2) goto out;

    expr_list_for_each_sym(prop->expr, e, sym) {
        sym2 = sym_check_sym_deps(sym);
        if (sym2) {
            fprintf(stderr, " -> %s", sym->name);
            break;
        }
    }
out:
    expr_list_for_each_sym(prop->expr, e, sym) sym->flags &= ~SYMBOL_CHECK;

    if (sym2 && sym_is_choice_value(sym2) && prop_get_symbol(sym_get_choice_prop(sym2)) == choice) sym2 = choice;

    return sym2;
}

struct symbol *sym_check_deps(struct symbol *sym) {
    struct symbol *sym2;
    struct property *prop;

    if (sym->flags & SYMBOL_CHECK) {
        fprintf(stderr, "%s:%d:error: found recursive dependency: %s", sym->prop->file->name, sym->prop->lineno, sym->name ? sym->name : "<choice>");
        return sym;
    }
    if (sym->flags & SYMBOL_CHECKED) return NULL;

    if (sym_is_choice_value(sym)) {
        /* for choice groups start the check with main choice symbol */
        prop = sym_get_choice_prop(sym);
        sym2 = sym_check_deps(prop_get_symbol(prop));
    } else if (sym_is_choice(sym)) {
        sym2 = sym_check_choice_deps(sym);
    } else {
        sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
        sym2 = sym_check_sym_deps(sym);
        sym->flags &= ~SYMBOL_CHECK;
    }

    if (sym2) {
        fprintf(stderr, " -> %s", sym->name ? sym->name : "<choice>");
        if (sym2 == sym) {
            fprintf(stderr, "\n");
            zconfnerrs++;
            sym2 = NULL;
        }
    }

    return sym2;
}

struct property *prop_alloc(enum prop_type type, struct symbol *sym) {
    struct property *prop;
    struct property **propp;

    prop = malloc(sizeof(*prop));
    memset(prop, 0, sizeof(*prop));
    prop->type = type;
    prop->sym = sym;
    prop->file = current_file;
    prop->lineno = zconf_lineno();

    /* append property to the prop list of symbol */
    if (sym) {
        for (propp = &sym->prop; *propp; propp = &(*propp)->next)
            ;
        *propp = prop;
    }

    return prop;
}

struct symbol *prop_get_symbol(struct property *prop) {
    if (prop->expr && (prop->expr->type == E_SYMBOL || prop->expr->type == E_LIST)) return prop->expr->left.sym;
    return NULL;
}

const char *prop_get_type_name(enum prop_type type) {
    switch (type) {
        case P_PROMPT:
            return "prompt";
        case P_ENV:
            return "env";
        case P_COMMENT:
            return "comment";
        case P_MENU:
            return "menu";
        case P_DEFAULT:
            return "default";
        case P_CHOICE:
            return "choice";
        case P_SELECT:
            return "select";
        case P_RANGE:
            return "range";
        case P_UNKNOWN:
            break;
    }
    return "unknown";
}

void prop_add_env(const char *env) {
    struct symbol *sym, *sym2;
    struct property *prop;
    char *p;

    sym = current_entry->sym;
    sym->flags |= SYMBOL_AUTO;
    for_all_properties(sym, prop, P_ENV) {
        sym2 = prop_get_symbol(prop);
        if (strcmp(sym2->name, env)) menu_warn(current_entry, "redefining environment symbol from %s", sym2->name);
        return;
    }

    prop = prop_alloc(P_ENV, sym);
    prop->expr = expr_alloc_symbol(sym_lookup(env, SYMBOL_CONST));

    sym_env_list = expr_alloc_one(E_LIST, sym_env_list);
    sym_env_list->right.sym = sym;

    p = getenv(env);
    if (p)
        sym_add_default(sym, p);
    else
        menu_warn(current_entry, "environment variable %s undefined", env);
}
